A recent episode of the Concentrating on Chromatography podcast features Dr. Emanuela Gionfriddo, Associate Professor of Chemistry at the University at Buffalo (SUNY), discussing solid phase microextraction (SPME), green analytical chemistry, and the surprisingly stubborn challenge of measuring PFAS. While SPME and nitrogen blowdown evaporation sit at different points in the sample prep workflow, they share the same underlying mission: concentrating trace analytes efficiently, cleanly, and without losing what you're trying to measure. Her conversation offers three takeaways that matter directly to labs running environmental, forensic, food, or clinical samples ahead of GC or LC-MS analysis.
Watch the full conversation with Dr. Emanuela Gionfriddo:
Who Is Dr. Gionfriddo, and Why Her Work Matters
Dr. Gionfriddo trained under Dr. Janusz Pawliszyn — the inventor of SPME — at the University of Waterloo before launching her own research program, first at the University of Toledo and now at the University at Buffalo. Her lab develops miniaturized, environmentally friendly microextraction methods for environmental, biological, and forensic sample types, with a particular focus on getting cleaner, more direct measurements without relying on surrogate materials. For any lab wrestling with trace-level detection limits, her guiding question — how do we concentrate analytes with less waste and more precision? — will sound familiar.
Green Analytical Chemistry Isn't Optional Anymore
Dr. Gionfriddo makes a direct case that SPME satisfies the twelve principles of green analytical chemistry: it minimizes organic solvent use, relies on reusable devices instead of disposable consumables, and cuts overall laboratory waste. Because SPME folds sampling, extraction, and pre-concentration into a single solvent-free step, it also reduces the energy and time costs baked into multi-step workflows.
That same green-chemistry logic applies to the evaporation step in a conventional sample prep workflow. Nitrogen blowdown evaporation replaces older, bulkier techniques like open-air drying or large-volume rotary evaporation with a controlled, low-waste dry-down process that protects sensitive analytes from degradation and cross-contamination. As accreditation bodies, journal reviewers, and grant panels increasingly scrutinize a lab's environmental footprint, documented low-waste sample prep — whether it's SPME upstream or controlled nitrogen evaporation downstream — has become a genuine competitive advantage rather than a box-checking exercise.
The Volatile PFAS Problem: Getting the Analyte to the Instrument
One of the most useful insights from the interview is Dr. Gionfriddo's observation that the hardest part of volatile PFAS analysis isn't detection instrumentation — it's capturing these highly volatile compounds and transferring them to the GC without losing sample along the way. Volatile PFAS behave nothing like their long-chain, non-volatile cousins; any aggressive or poorly controlled concentration step can vaporize away the very analyte a lab is trying to quantify.
This challenge sits squarely on top of tightening federal enforcement. The EPA's 2024 National Primary Drinking Water Regulation set enforceable maximum contaminant levels as low as 4.0 parts per trillion for PFOA and PFOS, giving public water systems a hard five-year compliance deadline. Meeting limits at the parts-per-trillion level leaves virtually no margin for analyte loss anywhere in the workflow — including the concentration step. Whether a lab uses SPME fiber extraction or a conventional solvent-extraction-plus-evaporation approach, the shared vulnerability is the same: preventing volatilization and sample loss during concentration. This is precisely the problem that controlled nitrogen evaporation is designed to solve, using gentle, adjustable gas flow and temperature control instead of aggressive heat or vacuum that can strip away volatile fractions.
The Mascara Study: A Wake-Up Call on Matrix Complexity
Perhaps the most attention-grabbing part of the interview is Dr. Gionfriddo's PFAS-in-cosmetics research. Her lab tested mascara formulations using both SPME-LC-MS/MS and automated micro-SPE and found that mascara matrices demanded tightly matrix-matched calibration — a generic calibration curve built from one brand couldn't reliably quantify PFAS in another, because formulation differences introduced significant matrix effects.
The timing lines up with real regulatory movement. The FDA's December 2025 report on PFAS in cosmetics identified dozens of intentionally added PFAS compounds across product categories, while acknowledging that toxicological data remains incomplete for most of them — and a growing list of states has already moved to ban intentional PFAS addition in cosmetic products regardless of federal action. For any lab doing complex-matrix trace analysis — cosmetics, food, biological fluids — the practical lesson is the same one Dr. Gionfriddo emphasizes: matrix effects are not theoretical footnotes. Any concentration or evaporation step used before analysis needs to be validated against the actual matrix under test, not a convenient stand-in.
Practical Takeaways for Labs Doing Trace-Level Work
A few actionable points emerge directly from the conversation:
-
Invest time in understanding the fundamentals of your extraction and concentration technique. Dr. Gionfriddo notes that SPME is an equilibrium-based technique, and skipping the theory is the most common reason users get inconsistent results.
-
Choose sample prep equipment that gives per-sample control over gas flow, temperature, and timing, so volatile or sensitive analytes aren't lost during concentration.
-
Validate methods against matrix-matched standards, especially for complex or novel sample types like cosmetics, biopolymers, or environmental composites.
-
Build ultra-trace-capable, low-waste workflows now, ahead of tightening PFAS enforcement under EPA drinking water rules and possible future FDA cosmetics regulation.
The Bigger Picture
Dr. Gionfriddo's research is a reminder that the sample prep step — not just the instrument — often determines whether a trace-level measurement succeeds or fails. For labs pushing detection limits down toward parts-per-trillion territory, whether in drinking water, cosmetics, or biological samples, the principles she champions — theoretical rigor, matrix-specific validation, and low-waste concentration — apply just as much to a nitrogen evaporation step as they do to SPME fiber selection. Listeners interested in the full technical discussion, including her lab's work on biomimetic sorbents and microplastics, can catch the complete episode when it airs on the Concentrating on Chromatography analytical chemistry podcast.